Cow

Cows are featured as a running gag throughout the Call of Duty series, especially in some of the earlier games in the series with levels that take place in Normandy. This prompted the developers to jokingly put "No cows were harmed in the making of this game" in the credits of the first two games.

Cows (also known as Bulls) appear in Dead Ops Arcade as animals who walk across the map in single file lines. Anything that touches a cow will get trampled. They can only be killed by explosives. Glowing cows give the player a large amount of treasure when killed.

Call of Duty: Ghosts features cows (not real) on the map Stonehaven in a field outside the map near the Ghosts spawn. To see the cows, go to the A bomb building, second floor, and then look. They are visible without a sniper rifle.